Gordian Knot
Mr. Greevy,
Maybe you should merely cut the Gordian Knot, here. Hornady and others have cannibalized their custom desks and CNC machinery, to play catch up with their back orders. Hornady is 25 weeks behind and isn't taking custom orders, right now, anyway.
You didn't say just what action you have. If possible, I'd suggest you just have it re-barreled to whatever the commercial parent cartridge is. If you want to do it again as the Greevy Express, then you are going down the same path as I am right now. I've ordered a 6mm x 300 RCM finish reamer and GO head space gauge from PT&G. They are eight weeks or so, out. I still have to make some bulged out cases from 40 fired 6.5 Rem Mag ones I bought in a bag. With my reamer print and fired samples, I may be able to order real custom dies, by next Spring. I also ordered a .306 dia. bored through die blank from PT&G. I'll put an oversized .308 pilot, and make this into an intermediate forming die.
It's going to take a home brewed reamer to do a sizing die, made from one of these PT&G blanks with the proper 6mm diameter hole bored through it. This one will take a .284 caliber pilot, polished down a bit.
You already have the rifle with a finished chamber. You might think of making a single blade D form reamer, for a seating die. Then, just kissing it with a grind stone in a fixture, will take the three or four thousandths off the hole it reams. This is where you can get the two dimensions for the seater and the sizer. Its really slow, but its doable for an amateur. I was warned to leave four or five thousandths over my finish dimensions in the blank which I took out of my lathe, to deal with the inevitable warping, in the quench.
The PT&G die blanks come in about every bore size and are made from 4140. You can use them as is, have them carburized, or even given an industrial hard chrome plating. Just remember that their .270 caliber hole, is actually a .306" hole, to allow for the case neck. So ordering a $1, 270 cal. Pilot from them, won't work here. You have to work over a .308 Pilot to center your reamer in their 270 cal. die blank. Counter intuitive, to be sure, but I hashed this out over the phone with the person responsible for making my finish reamer, there. Reamer pilots and the bores, reamed in die blanks are apples and oranges.
